impact hex head Hex wrench drill bits. Torsion zone to absorb torque peaks to avoid breakage. For impact driver and heavy screw driving. 10pcs metric hex bits set-1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 5mm, 6mm, 7mm, 8mm. 10pcs SAE hex bits set-5/64inch,3/32inch, 7/64inch, 1/8inch, 9/64inch, 5/32inch, 3/16inch, 7/32inch, 1/4inch, 5/16inch. 1/4inch quick release hex-shank, 4inch long. Extended length to meet more needs. 4 inch long hex bits is longer than the market ones, more practical and convenient. Extra length provide additional clearance for reaching into tight spaces. After contacting the screw head, the collision reaction force generated by the impact screwdriver is absorbed by the torque part, effectively preventing the cutter head from breaking. CNC machined tips, S2 alloy steel body, hardened core to increase bit strength and reduce fracture. Manganese Phosphate surface to prevent rust. Strengthened magnetic impact bit helps you easy pick up screws. Widely used in home repairs, automobiles and other screw driving applications. Colour:Black&Orange Material:alloy steel Package Contents: 10 x Metric hexagon socket head 10 x Imperial hexagon socket head Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.